Disclaimer: This is not specific legal advice - only a general discussion based off of the limited facts you have presented. Seek specific legal advice before continuing with your project.
1) The Fabric Maker's License: The only effect the fabric maker's license has on you, is that it keeps you from becoming an innocent infringer (which doesn't mean you're innocent - it just means you pay less of a penalty than a willful infringer). So, assuming the fabric maker has permission to use the marks and images, none of the other conditions of the contract apply to you - you were not a party and are not bound by the terms. The only exception to this would be if Lucas and the fabric maker agreed to make you a third-party beneficiary to the contract. For example, they agree that no client of fabric maker can be sued by Lucas for copyright or trademark infringement. Even in that case, you have no duties to Lucas or the fabric maker, but you still can enforce any benefits the contract conferred upon you.
2) Copyright Infringement: Assuming that the fabric maker had a license to make the product, the first sale doctrine would probably apply. This means that once you purchase something, you are free to do with it as you please, including re-sale. Because of this, there is most likely no copyright infringement.
3) Trademark Infringement: This is a little more difficult. Trademark infringement is usually determined by consumer confusion. Having disclaimers at the point of sale and attached to the product (like a price tag) would help eliminate any confusion for people buying the product. BUT, once the price tag is removed and the buyer uses the product in public, those people might be confused as to the creator of the product. I think you would have a good case considering they licensed the mark to be used on fabric which, by its very nature, is meant to be transformed in to some other product.
4) Other Concerns: dstarh linked to some cases where the author points out where people have won in similar situations. But understand that winning is a very subjective term. I seriously doubt that they received their attorney's fees back and, in a federal lawsuit, those can easily dwarf any earnings from a small company. Before you do this, consult with an attorney in your state to ensure that you are running your business in a way that would shield you personally from any liability should you lose a lawsuit or have a default judgment entered because you could not afford to hire an attorney to defend you. I know it sounds negative, but a little bit of planning upfront can save you big if something were to go bad.